CI: Prepare Rust modules

Adding Rust architecture modules for ensure compilation.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

.github/workflows/build.yml

@@ -40,6 +40,12 @@ jobs:
           git clone https://github.com/arduino/ArduinoCore-API.git $MODULE_PATH/../ArduinoCore-API
           cp -rfp $MODULE_PATH/../ArduinoCore-API/api $MODULE_PATH/cores/arduino/
 
+      - name: Setup Rust toolchain
+        run: |
+          apt install rustup
+          rustup default stable
+          rustup target add thumbv6m-none-eabi thumbv7em-none-eabihf thumbv7em-none-eabi thumbv7m-none-eabi
+
       - name: Build fade
         run: |
           west build -p -b arduino_nano_33_ble/nrf52840/sense $MODULE_PATH/samples/fade